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Maass wave form : ウィキペディア英語版
Maass wave form
In mathematics, a Maass wave form or Maass form is a function on the upper half plane that transforms like a modular form but need not be holomorphic. They were first studied by Hans Maass in .
==Definition==
Let ''k'' be a half-integer, ''s'' be a complex number, and Γ be a discrete subgroup of SL2(R). A Maass form of weight ''k'' for Γ with Laplace eigenvalue ''s'' is a smooth function from the upper half-plane to the
complex numbers satisfying the following conditions:
*For all \gamma = \left(\begin a & b \\ c & d\end\right) \in \Gamma and all \tau \in \mathbb, we have f\left(\frac\right) = (c\tau+d)^k f(\tau).
*We have \Delta_ f = s f , where \Delta_ is the weight ''k'' hyperbolic laplacian defined as \Delta_ =
-y^ \left(\frac} + \frac}\right)+
i k y \left(\frac + i \frac\right).
*The function ''f'' is of at most polynomial growth at cusps.
A weak Maass wave form is defined similarly but with the third condition replaced by "The function ''f'' has at most linear exponential growth at cusps". Moreover, f is said to be harmonic if it is annihilated by the Laplacian operator.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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